Incompleteness and Uncertainty in Information Systems: by Martin S. Feather (auth.), V. S. Alagar PhD, S. Bergler PhD,

By Martin S. Feather (auth.), V. S. Alagar PhD, S. Bergler PhD, F. Q. Dong PhD (eds.)

The software program Engineering and Knowledgebase structures (SOFfEKS) examine staff of the dep. of desktop technological know-how, Concordia collage, Canada, geared up a workshop on Incompleteness and Uncertainty in details platforms from October 8-9, 1993 in Montreal. an important objective of the workshop was once to compile researchers who percentage a priority for problems with incompleteness and uncertainty. The workshop attracted humans doing primary examine and undefined­ orientated study in databases, software program engineering and AI from North the United States, Europe and Asia. The workshop application featured six invited talks and twenty different shows. The invited audio system have been: Martin Feather (University of Southern CalifornialInformation structures Institute) Laks V. S. Lakshmanan (Concordia college) Ewa Orlowska (Polish Academy of Sciences) z. Pawlak (Warsaw Technical college and Academy of Sciences) F. Sadri (Concordia collage) A. Skowron (Warsaw college) The papers might be labeled into 4 teams: tough units and common sense, thought research, databases and knowledge retrieval, and software program engineering. The workshop opened with a hot welcome speech from Dr. Dan Taddeo, Dean, college of Engineering and computing device technological know-how. the 1st day's shows have been in tough units, databases and knowledge retrieval. Papers given at the moment day established round software program engineering and inspiration research. enough time used to be given in among displays to advertise lively interactions and various energetic discussions. on the finish of 2 days, the members expressed their wish that this workshop will be continued.

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Extra info for Incompleteness and Uncertainty in Information Systems: Proceedings of the SOFTEKS Workshop on Incompleteness and Uncertainty in Information Systems, Concordia University, Montreal, Canada, 8–9 October 1993

Sample text

Hence all formulas that are substitutions of theorems of logic 85 are valid in INDL. The problem of complete axiomatization of the logic is open, however several results have been obtained for fragments of INDL, and several extensions of the logic have been introduced. In [3] completeness has been proved for the fragment of INDL, introduced in [2], without parameter expressions and with semantics restricted to models with what is called local agreement: for any indiscernibility relations R, 8 and for any object 0 either R( 0) ~ 8(0) or 8(0) ~ R(o).

Knowledge operators K(A) are nonmonotonic. Example 10 Consider OB = {sl, ... , s7} and indiscernibility relation IND(A) that provides the following equivalence classes: {sl, s2}, {s3, s4}, {s5, s6}, {s7}. Consider sets X = {sl,s2,s3} and Y = {sl,s2,s3,s4,s5}. We have K(A)X = {sl, s2, s5, s6, s7} and K(A)Y = {sl, s2, s3, s4, s7}. Systems of the form: E (OB, ACT, {IN D(A)}ACAGT, {K(A)}ACAGT) will be called epistemic systems:- They serve as -semantical structures for the epistemic logic defined in section 5.

Bulletin of the Section of Logic, 1987; (16)1:26-38. Also Zeitschrift fur Mathematische Logik und Grundlagen der Mathematik, 1989; 35:559-572 [22] Orlowska E. Kripke models with relative accessibility and their application to inferences from incomplete information. Banach Center Publications, Polish Scientific Publishers Warsaw, 1987; 21:327-337 [23] Orlowska E. Logical aspects of learning concepts. International Journal of Approximate Reasoning 1988; (2)349-364 [24] Orlowska E. Representation of vague information.

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